LOS ANGELES — Entertainment executive and philanthropist David Geffen has pledged $150 million to build a new building at the Los Angeles County Museum of Art, the largest single cash gift from an individual in the museum’s history, LACMA announced today.

Geffen’s pledge raises LACMAs fundraising total to $450 million of the $650 million needed to break ground on a modernist Peter Zumthor building.

The Zumthor building will be named the David Geffen Galleries and replace four of the museum’s seven buildings, according to the LACMA statement.

“I am excited to see the positive effects this new building will have on Los Angeles’s art and architectural communities,” Geffen said. “This innovative addition to the LACMA campus will ensure ongoing and expanded access to their permanent collection. LACMA will be able to touch millions of lives and create an even healthier and more vibrant community for everyone.”

The Geffen gift comes after more than three years of relentless fundraising spearheaded by museum Director Michael Govan.

Board of Supervisors Chairman Mark Ridley-Thomas called the Geffen gift a “game-changer” for the museum and “an inspiring example of how private philanthropists can partner with public institutions to expand architectural and artistic horizons for everyone.”

L.A. Mayor Eric Garcetti added that “David Geffen’s monumental gift to LACMA will live as an example of how philanthropy can transform institutions and touch people across generations.”